Coded data generation or conversion – Digital pattern reading type converter – Incremental
Patent
1997-04-09
1999-07-27
Williams, Howard L.
Coded data generation or conversion
Digital pattern reading type converter
Incremental
25023117, H03M 130, G01D 534
Patent
active
059297891
ABSTRACT:
A position encoder system is provided, the system employing a medium having a track with incremental markings which define an embedded reference position identifier. Upon movement of the medium, a sensor detects passage of the incremental markings, each such marking being indicative of a predetermined movement of the medium. The sensor also detects the embedded reference position identifier, and correspondingly, provides a recognizable index pulse for use in determining an absolute position of the medium.
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Hewlett-Packard Model 3820A, Electronic Total Station, Service Manual, Hewlett-Packard Company 1979.
Hewlett-Packrd Company
Williams Howard L.
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